新白云站大体积混凝土楼板跳仓法施工有限元分析  

Finite Element Simulation of Mass Concrete Floorslabs in New Baiyun Railway Station by Sequence Method

作　　者：杜鹤 严晗[2] 宋宝仓[2] 刘俊 刘建坤 梁思明 Du He;Yan Han;Song Baocang;Liu Jun;Liu Jiankun;Liang Siming(School of Civil Engineering,Sun Yat-sen University,Zhuhai 519082,China;China Railway Construction Engineering Group,Beijing 100070,China;China Railway Construction Engineering Group Guangdong Co.,Ltd.,Guangzhou 511493,China)

机构地区：[1]中山大学土木工程学院,广东珠海519082 [2]中铁建工集团有限公司,北京100070 [3]中铁建工集团广东有限公司,广东广州511493

出　　处：《市政技术》2023年第2期31-37,共7页Journal of Municipal Technology

基　　金：国家自然科学基金项目(52108263);中铁建工集团有限公司科技攻关项目(K2276140009)。

摘　　要：为评估跳仓法施工对大体积混凝土早期应力的影响,基于有限元方法分析不同因素下单块大体积混凝土楼板的早期应力,采用灰色关联度方法确定不同因素的影响程度,并对新白云站大体积混凝土楼板的跳仓法施工进行仿真分析。结果表明:入模温度、混凝土绝热温升值、楼板平面尺寸、楼板厚度、环境对流系数、垫层弹性模量对大体积混凝土楼板早期应力的影响程度依次降低;大体积混凝土楼板内部的钢筋可降低其早期应力,但对其影响可忽略不计;减小大体积混凝土楼板的仓块尺寸可有效降低其早期应力;仓块的浇筑顺序会影响大体积混凝土楼板早期应力的发展,有规律的浇筑顺序可使混凝土受力趋于均匀,以减少应力集中现象。In order to evaluate the influence of sequence method on the early-age stress of mass concrete, finite element simulation was employed to analyze the early-age stress of single mass concrete floorslab under different conditions. The influential degree of the various factors was determined by grey correlation analysis. Finally, the sequence method by the mass concrete floorslabs of new Baiyun Railway Station was simulated. The results show that the influences of molding temperature, adiabatic temperature rise of concrete, floorslab size, floorslab thickness,interfacial convection coefficient, and elastic modulus of cushion on the early-age stress decrease in turn;The reinforcement in the floor slab can reduce the early-age stress, but the effect can be ignored;The earl-age stress can be effectively reduced by decreasing the floorslab size;The pouring sequence of the floorslab will affect the development of early-age stress. A regular pouring sequence can make the stress of concrete balance to reduce the stress concentration of the mass concrete.

关 键 词：跳仓法 理论分析 大体积混凝土 水化热 灰色关联度分析 有限元仿真 早期应力 

分 类 号：TU375.2[建筑科学—结构工程]